Patents by Inventor Anders Lehman
Anders Lehman has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11543182Abstract: A furnace assembly for a metal-making process, including: an electric arc furnace configured for flat bath operation and having a bottom, and an electromagnetic stirrer configured to be arranged underneath the bottom of the electric arc furnace to enable stirring of molten metal in the electric arc furnace.Type: GrantFiled: January 7, 2021Date of Patent: January 3, 2023Assignees: ABB Schweiz AG, Tenova S.p.A.Inventors: Lidong Teng, Anders Lehman, Hongliang Yang, Andrea Grasselli, Silvio Maria Reali
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Publication number: 20220040755Abstract: An arrangement for controlling flow speed in a mold for continuous casting of metal includes: at least two first front cores with associated first magnetic coils arranged on one side of the mold; at least two second front cores with associated second magnetic coils arranged on an opposite side of the mold in substantial alignment with the first front cores; an external magnetic loop connecting the second front cores to the first front cores, to allow a one-directional magnetic flux to pass through the mold from the first front cores to the second front cores or vice versa; and a control interface enabling independent control of two subsets of the first magnetic coils.Type: ApplicationFiled: January 27, 2020Publication date: February 10, 2022Inventors: Hongliang Yang, Martin Sedén, Nils Peter Jacobson, Anders Lehman
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Publication number: 20210164731Abstract: A furnace assembly for a metal-making process, including: an electric arc furnace configured for flat bath operation and having a bottom, and an electromagnetic stirrer configured to be arranged underneath the bottom of the electric arc furnace to enable stirring of molten metal in the electric arc furnace.Type: ApplicationFiled: January 7, 2021Publication date: June 3, 2021Inventors: Lidong Teng, Anders Lehman, Hongliang Yang, Andrea Grasselli, Silvio Maria Reali
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Patent number: 10921060Abstract: A furnace assembly for a metal-making process, including: an electric arc furnace configured for flat bath operation and having a bottom, and an electromagnetic stirrer configured to be arranged underneath the bottom of the electric arc furnace to enable stirring of molten metal in the electric arc furnace.Type: GrantFiled: February 10, 2017Date of Patent: February 16, 2021Assignees: ABB Schweiz AG, Tenova S.p.A.Inventors: Lidong Teng, Anders Lehman, Hongliang Yang, Andrea Grasselli, Maria Silvio Reali
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Patent number: 10780490Abstract: An electromagnetic brake system for a metal-making process. The electromagnetic brake system includes a two-level magnetic structure, in particular an upper magnetic core structure configured to be mounted to an upper portion of a mold and a lower magnetic core structure configured to be mounted to a lower portion of a mold. Lateral coils on the upper magnetic structure are configured to be controlled to generate a first magnetic field in a first field direction and inner coils are configured to be controlled to generate a second magnetic field in a second field direction, simultaneously with the first magnetic field. The lower magnetic core structure has lower coils which are configured to be controlled to generate a third magnetic field in the first direction simultaneously as the lateral coils and the inner coils generate their fields.Type: GrantFiled: May 29, 2018Date of Patent: September 22, 2020Assignee: ABB Schweiz AGInventors: Martin Tobias Sedén, Anders Lehman, Jan-Erik Eriksson
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Publication number: 20200156146Abstract: An electromagnetic brake system for a metal-making process. The electromagnetic brake system includes a two-level magnetic structure, in particular an upper magnetic core structure configured to be mounted to an upper portion of a mold and a lower magnetic core structure configured to be mounted to a lower portion of a mold. Lateral coils on the upper magnetic structure are configured to be controlled to generate a first magnetic field in a first field direction and inner coils are configured to be controlled to generate a second magnetic field in a second field direction, simultaneously with the first magnetic field. The lower magnetic core structure has lower coils which are configured to be controlled to generate a third magnetic field in the first direction simultaneously as the lateral coils and the inner coils generate their fields.Type: ApplicationFiled: May 29, 2018Publication date: May 21, 2020Inventors: Martin Tobias Sedén, Anders Lehman, Jan-Erik Eriksson
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Publication number: 20190390908Abstract: A furnace assembly for a metal-making process, including: an electric arc furnace configured for flat bath operation and having a bottom, and an electromagnetic stirrer configured to be arranged underneath the bottom of the electric arc furnace to enable stirring of molten metal in the electric arc furnace.Type: ApplicationFiled: February 10, 2017Publication date: December 26, 2019Inventors: Lidong Teng, Anders Lehman, Hongliang Yang, Andrea Grasselli, Maria Silvio Reali
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Patent number: 10207318Abstract: A method of controlling molten metal flow and an electromagnetic brake system for a metal-making process, including: a first magnetic core arrangement having a first and second long sides with Nc teeth, and arranged to be mounted to opposite longitudinal sides of an upper portion of a mould, a first set of coils, each being wound around a respective tooth of the first magnetic core arrangement, and Np power converters, with Np being an integer that is at least two and Nc is an integer that is at least four and evenly divisible with Np, wherein each power converter is configured to feed a DC current to its respective group of 2Nc/Np series-connected coils.Type: GrantFiled: November 20, 2014Date of Patent: February 19, 2019Assignee: ABB Schweiz AGInventors: Anders Lehman, Jan-Erik Eriksson, Martin Sedén
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Publication number: 20170216909Abstract: A method of controlling molten metal flow and an electromagnetic brake system for a metal-making process, including: a first magnetic core arrangement having a first and second long sides with Nc teeth, and arranged to be mounted to opposite longitudinal sides of an upper portion of a mould, a first set of coils, each being wound around a respective tooth of the first magnetic core arrangement, and Np power converters, with Np being an integer that is at least two and Nc is an integer that is at least four and evenly divisible with Np, wherein each power converter is configured to feed a DC current to its respective group of 2Nc/Np series-connected coils.Type: ApplicationFiled: November 20, 2014Publication date: August 3, 2017Inventors: Anders Lehman, Jan-Erik Eriksson, Martin Sedén
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Patent number: 7975753Abstract: Method for controlling a flow of molten steel in a mould by applying at least one magnetic field to the molten steel in a continuous slab casting machine. Controlling a molten steel flow velocity on a molten steel bath surface to a predetermined molten steel flow velocity by applying a static magnetic field to impart a stabilizing and braking force to a discharge flow from an immersion nozzle when the molten steel flow velocity on the meniscus is higher than a mould powder entrainment critical flow velocity. Controlling the molten steel flow velocity on the meniscus to a range of from an inclusion adherence critical flow velocity or more to a mould powder entrainment critical flow velocity or less by applying a shifting magnetic field to increase the molten steel flow when the molten steel flow velocity on the meniscus is lower than the inclusion-adherence critical flow velocity.Type: GrantFiled: January 6, 2009Date of Patent: July 12, 2011Assignee: ABB ABInventors: Anders Lehman, Helmut Hackl, Jan-Erik Eriksson, Olof Sjoden
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Publication number: 20090120604Abstract: A method for controlling a flow of molten steel in a mould by applying at least one magnetic field to the molten steel in a continuous slab casting machine. This is achieved by comprising controlling a molten steel flow velocity on a molten steel bath surface, meniscus, to a predetermined molten steel flow velocity by applying a static magnetic field to impart a stabilizing and braking force to a discharge flow from an immersion nozzle when the molten steel flow velocity on the meniscus is higher than a mould powder entrainment critical flow velocity and by controlling the molten steel flow velocity on the meniscus to a range of from an inclusion adherence critical flow velocity or more to a mould powder entrainment critical flow velocity or less by applying a shifting magnetic field to increase the molten steel flow when the molten steel flow velocity on the meniscus is lower than the inclusion-adherence critical flow velocity.Type: ApplicationFiled: January 6, 2009Publication date: May 14, 2009Inventors: Anders Lehman, Helmut Hackl, Jan-Erik Eriksson, Olof Sjoden
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Patent number: 7320356Abstract: A device for braking a flow of molten metal (5) in a device for continuous or semi-continuous casting of metals in a mould (2) which is provided with opposite broad sides (4) and opposite short sides (3), said device comprising at least one magnet core (1), said at least one core facing one of the short sides (3) of the mould (2) for the purpose of generating a magnetic field (B) and an induced current (i) in a region of the molten metal (5) adjacent the short side (3). The core (1) is arranged in such a way that the magnet field (B) which is generated in said region generally has a direction perpendicular from the short side (3) of the mould (2) towards the centre of the latter.Type: GrantFiled: January 10, 2002Date of Patent: January 22, 2008Assignee: ABB ABInventor: Anders Lehman
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Patent number: 6843305Abstract: A method of controlling the flow of molten metal in non-solidified portions of a strand (3) during continuous casting, and a device for application of the method. The device comprises a two-phase or plural-phase stirrer (1) arranged around a mould (6) that is open in opposite ends and that surrounds the strand (3), said stirrer (1) being arranged to generate a moving magnetic field in the melt, and at least one magnetic flow-conducting body (15) being placed between an inner periphery of said stirrer (1) and the outer periphery of the mould (6).Type: GrantFiled: April 7, 2001Date of Patent: January 18, 2005Assignee: ABB Group Services Center, ABInventors: Anders Lehman, Per Larsson
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Publication number: 20040060786Abstract: A device for braking a flow of molten metal (5) in a device for continuous or semi-continuous casting of metals in a mould (2) which is provided with opposite broad sides (4) and opposite short sides (3), said device comprising at least one magnet core (1), said at least one core facing one of the short sides (3) of the mould (2) for the purpose of generating a magnetic field (B) and an induced current (i) in a region of the molten metal (5) adjacent the short side (3). The core (1) is arranged in such a way that the magnet field (B) which is generated in said region generally has a direction perpendicular from the short side (3) of the mould (2) towards the centre of the latter.Type: ApplicationFiled: October 23, 2003Publication date: April 1, 2004Inventor: Anders Lehman
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Publication number: 20030183363Abstract: A method of controlling the flow of molten metal in non-solidified portions of a strand (3) during continuous casting, and a device for application of the method. The device comprises a two-phase or plural-phase stirrer (1) arranged around a mould (6) that is open in opposite ends and that surrounds the strand (3), said stirrer (1) being arranged to generate a moving magnetic field in the melt, and at least one magnetic flow-conducting body (15) being placed between an inner periphery of said stirrer (1) and the outer periphery of the mould (6).Type: ApplicationFiled: February 12, 2003Publication date: October 2, 2003Inventors: Anders Lehman, Per Larsson
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Patent number: 6463995Abstract: A device for continuous or semi-continuous casting of metal has a cooled continuous casting mold assembly and an inductive coil arranged at the top end of the mold assembly. The mold assembly is divided into at least two mold assembly parts separated and electrically insulated from each other by partitions, which are oriented in the casting direction and where each partition is formed with an electrically insulating barrier. Each mold assembly part has a mold part associated with a corresponding mechanically supporting mold back-up structure part, and an electrical conductor, with an electrical conductivity higher than the electrical conductivity of the back-up structure. The conductor is arranged with the mold back-up structure part on the side of the mold back-up structure part facing away from the mold, the outside face.Type: GrantFiled: August 31, 2000Date of Patent: October 15, 2002Assignee: ABB ABInventors: Anders Lehman, Erik Svensson, Tord Kroon
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Patent number: 6450241Abstract: A method and a device for continuous or semi-continuous casting of metal, where hot melt is supplied to a cooled continuous casting mold and the melt is cooled and formed to a at least partly solidified strand as it passes through the mold. An inductive coil is arranged at the top end of the mold to, when supplied with an alternating electric high frequency current, generate a high frequency magnetic field to act upon the melt in the mold, whereby heat is developed in the melt and compressive forces acting to separate the melt from the mold wall are generated. The coil is supplied with the high frequency current from a power supply unit with a current control to supply an alternating electric high frequency current having a base frequency of 50 Hz or more to the inductive coil. The current control has modulation means for modulating and controlling the supplied current is controlled in a pulsed, amplitude modulated manner with an amplitude modulated modulation frequency of 10 Hz.Type: GrantFiled: August 31, 2000Date of Patent: September 17, 2002Assignee: ABB ABInventor: Anders Lehman
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Patent number: 6340049Abstract: A device for continuous or semi-continuous casting of metal comprising a cooled mold (22) and an induction coil (10) arranged at the top end of the mold. The mold comprises in its top end a plurality of hollow, old segments (22a, 22b, 22c, 22d, 22e, 22f, 22′b, 22′c, 22′d) separated from each other by partitions (26a, 26b, 26c, 26d, 26e), which all comprise an electrically insulating barrier. Both the mold segments and the partitions are oriented essentially in the casting direction. Each hollow top end mold segment comprises a core of a mechanically supporting bar or beam (25a, 25b, 25c, 25d, 25e, 25f, 25′a, 25′b, 25′c, 25′d, 25′e, 25′f) arranged within the hollow mold segment such that it is surrounded by the hollow mold segment. The core exhibits superior mechanical properties in relation to the mold.Type: GrantFiled: September 1, 2000Date of Patent: January 22, 2002Assignee: ABB ABInventors: Anders Lehman, Erik Svensson, Tord Kroon, Jan-Erik Eriksson
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Patent number: 5740855Abstract: A device for slowing down the non-solidified portions of a cast strand during continuous casting of billets or blooms. The device comprises a group of at least three separate molds (1-4) which are open in the direction of casting and which are arranged such that each one is supplied with a flow of melt. The device also comprises a number of magnetic core parts (5-8), and at least one magnetic-field generating member (9-13), adapted to generate and transfer, together with the magnetic core parts, a static magnetic field or a periodic low-frequency magnetic field to the inflowing melt in such a way that the movement of the melt is slowed down. The magnetic core parts and the magnetic-field generating members are arranged such that, together with all the molds in the group, they form a common closed magnetic circuit. All the molds included in the group are arranged in series with each other in the closed magnetic circuit.Type: GrantFiled: March 17, 1997Date of Patent: April 21, 1998Assignee: ASEA Brown Boveri ABInventors: Jan Erik Eriksson, Magnus Hallefalt, Sten Kollberg, Anders Lehman